how to create _ldap._tcp.dc._msdcs.ActiveDirectoryDomainName file

[john]

I want yo joing a member server to a Active dirctory server. when I use
the dcpromo.exe and select a child option I am asked for user, pass and
doamin. when I hit ok I get a measage the it Qued the DNS and it was
missing the following file _ldap._tcp.dc._msdcs.Conson.com SRV. I
looked at that location and it is there. In the process I started to
create and delete files. Know I want to start from scratch and remove
the DNS and then re-install it on this Domain controller. If there is a
way to create this file that would help if there is a way to remove
this DNS and then re-create it to reflect new information that would
also work.

Note when I do NSlookup i get
default server: unknown
server1.conson.com 192.168.1.1
Is there a way to update this information. 

thanks
john